Performance Research of Materials and Engineering Application of Overburden Strata Separation-Zone Grouting Technology

Table 1

Table of physical and mechanical test results of rock injected with three holes in the T2191 working face of Tangshan Mine.

Level number	Rock name	Total thickness (m)	Lamination thickness (m)	Compressive strength (MPa)	Tensile strength (MPa)	Elastic modulus(×10^4 MPa)	Poisson’s ratio	Bulk density (g/cm^3)
	Alluvium
	Coreless drilling
1	Coarse sandstone	240–242.75	2.75	99.2	3.69	2.3	0.28	2.474
2	Fine sand	245.95	3.2	61.4	2.17	1.0	0.17	2.599
3	Coarse sandstone	250.78	4.83	65.2	2.91	1.6	0.17	2.465
4	Coarse sandstone	254.98–257.45	2.47	63.2	3.06	1.2	0.23	2.452
5	Mudstone	258.17	0.72	63.6	2.47	2.1	0.49	2.709
6	Siltstone	259.40	1.23	48.3	1.17			2.540
7	Coarse sandstone	264.20	4.8	97.7	4.22	1.7	0.18	2.516
8	Coarse sandstone	265.4–273.39	7.99	84.5	3.12	1.4	0.20	2.542
9	Siltstone	274.80	1.41	16.1	1.51			2.628
10	Medium sandstone	276.72	1.92	131.3	3.94	2.4	0.12	2.518
11	Coarse sandstone	281.59	4.87	85.5	3.51	1.9	0.16	2.495
12	Medium sandstone	284.00	2.41	93.4	5.11	2.0	0.13	2.672
13	Coarse sandstone	313.54	29.54	66.0	2.65	1.4	0.15	2.477
14	Siltstone	314.54–320.88	6.34	62.0	2.17	1.6	0.09	2.679
15	Medium sandstone	322.38	1.5	90.7	3.48	1.9	0.06	2.616
16	Siltstone	323.88	1.5	80.8	3.03			2.631
17	Medium sandstone	330.26-	6.38	98.0	3.26	2.0	0.06	2.512
18	Siltstone	333.05	12.79	49.2	1.84	1.5	0.12	2.569
19	Siltstone	333.95–337.71	3.76	8.3
20	Fine sandstone	342.57	4.86	120.8	5.59	2.3	0.13	2.586
21	Siltstone	375.13	32.56	29.7	1.31			2.571
22	Medium sandstone	376.18	1.03	124.2	3.93	2.8	0.10	2.595
23	Coarse sandstone	380.31	4.13	99.3	3.86	1.7	0.10	2.543
24	Medium sandstone	382.61	2.3	84.1	2.21	1.2	0.11	2.595
25	Medium sandstone	388.37	5.76	118.6	4.41	2.4	0.10	2.586
26	Siltstone	400.10	11.73	84.4	3.98	1.9	0.12	2.617
27	Medium sandstone	401.35	1.25	117.7	4.85	1.7	0.08	2.604
28	Siltstone	410.98	9.65	123.9	15.65	2.0	0.13	2.653
29	Siltstone	416.88	5.9	110.9	4.45	2.1	0.16	2.547
30	Siltstone	430.00	13.12	95.5	4.90	1.9	0.07	2.639